Geodesic
The congruence problem for a unitary group of rank $\ge2$
Sbornik. Mathematics, Tome 5 (1968) no. 3, pp. 351-355 
L. N. Vaserstein. The congruence problem for a unitary group of rank $\ge2$. Sbornik. Mathematics, Tome 5 (1968) no. 3, pp. 351-355. http://geodesic.mathdoc.fr/item/SM_1968_5_3_a2/
@article{SM_1968_5_3_a2,
     author = {L. N. Vaserstein},
     title = {The congruence problem for a unitary group of rank $\ge2$},
     journal = {Sbornik. Mathematics},
     pages = {351--355},
     year = {1968},
     volume = {5},
     number = {3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1968_5_3_a2/}
}
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